Membrane element sealing material holding member and membrane element

Abstract

A membrane element sealing material holding member that even when the dimension of outer diameter of center tube varies, enables holding of the center tube in the center and further enables easy insertion of the center tube; and a membrane element utilizing the same. The membrane element sealing material holding member comprises central opening (19) for insertion of a center tube of spiral membrane element, peripheral orifice (15a) for flowing of a raw liquid into a membrane end portion of membrane element and outer circumferential part (18) for holding of circular sealing material, wherein the central opening (19) has inner circumferential surface (16a) of cylindrical form with a diameter larger than the outer diameter of the inserted center tube, and wherein at three or more positions on the inner circumferential surface (16a), there is provided projection (21) that has sloping face (21a) on its side of center tube (6) insertion and is deformable at the time of insertion of center tube (6) with an outer diameter larger than that of incircle.

Description

TECHNICAL FIELD[0001]The present invention relates to a sealing material holding member that is attached to an end part of a spiral membrane element for holding a sealing material that shuts off the gap between a pressure vessel and the membrane element, as well as to a membrane element using the same.BACKGROUND ART[0002]Conventionally, a spiral separation membrane module is used for a variety of uses such as desalination of brine or sea water, production of ultrapure water, and processing of waste water. As shown in FIG. 7, a spiral separation membrane module has a structure such that a spiral separation membrane element E is housed in a pressure vessel 1, where the gap between the pressure vessel 1 and the element E is shut off with an annular sealing material 4 so as to let the supplied raw liquid 7 flow efficiently into the element E.[0003]The raw liquid that has flown into the element E is subjected to separation with a separation membrane while flowing to the downstream side a...

AI Technical Summary

Benefits of technology

The present invention relates to a sealing material holding member for a spiral membrane element used in a variety of applications such as desalination and waste water treatment. The sealing material holding member is attached to the end part of the membrane element and holds an annular sealing material that shuts off the gap between the membrane element and the pressure vessel. The invention provides a sealing material holding member that can hold a center tube at the center and facilitate the insertion of the center tube even if the outer diameter dimension of the center tube varies. This ensures a secure and easy connection between membrane elements for use. The technical effect of the invention is to improve the stability and commercial quality of the membrane element.

Problems solved by technology

When clearance is increased in consideration of such a variation, the center tube 6 is liable to become eccentric relative to the sealing material holding member 10, thereby aggravating the outer appearance and degrading the commercial quality of the product in some cases.

Also, when the center tube 6 is made eccentric, the operation of attaching the membrane element may become cumbersome depending on the structure of the pressure vessel 1, thereby raising a problem in that the connection operation may become cumbersome in connecting a plurality of membrane elements for use, or the like problem.

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